Free phase meter plug-ins?
Over the last couple of years I tested a few of these free plug-ins -- some are just too lame, others give readings that don't seem right... some wouldn't even recognize if there was an 'audible' problem. I also have that Edison thing: yet another (unreliable) reading [--> Withered parts, leaking caps?]
So sometimes I end up cross-checking the different readings and also do the time-proven switch-to-mono compatibility check. It's surprising that some commercial electronic music CDs by independant labels actually have massive phase (L-R polarity) problems. But since this music doesn't get much airplay anyway (if at all), some labels/engineers don't seem to care and, if they are aware of the problem, seem to accept out-of-phase as yet another sonic flavour . For CD-only releases this might be OK, to some degree at least -- and especially if switching to mono still yields satisfying results --, for vinyl however it's deadly.
Interesting to hear about the Edison. Curious, how do you know its reading is inaccurate?
What are you using as your 'trusted reference' ?
The two Edisons I have show different readings, indeed does give me that the feeling that they're
then most likely both off, but IIRC there's an internal adjustment, maybe it's just a matter
And let's actually first start by saying what we demand of a phase meter.
A highly accurate response on steady state signals ? Or little more than
some idea 'how mono' or 'how stereo'or 'how over-stereo' our mix is ?
Well, I am pretty sure I cannot spend $2000 plus for a precision hardware phase meter right now, but a DIY high-precision phase meter project and PCB would be great.
I don't think there's a need to spend that much on a phase-meter.
How much accuracy do you need ? Risking to sound like an advertisement
for that Mancini/Harris/Intersil-circuit, it claims 1% acc.
Need more for audio ? I doubt it.
So then little reason to use a more elaborate circuit than this one. While not revolutionary, note that it's 'smart' by using matched comparators (the transistor-array). Low parts count then results, while still having good accuracy.
While sure nice to have a PCB for it, that circuit is in essence just
three IC-packages, so putting it on veroboard (or the likes) is easy.
The only spot where a dedicated PCB might be nice is for the transistor-array,
which doesn't seem to come in 0.1" pitch, but SMD-only. I'm using an adapter-board
to regular pitch for it and the rest will be on vero.
The suggested ground plane in the Application Note might be ignored
when only using it for audio.